I would have thought a 3" front only lift would make the truck too high in the front. My old Daystar spacers were 2.5 front and 2 rear and it looked pretty level to me - maybe just another half inch.
I thought most people were using a 1" front to level it out. Wasn't there someone here who posted just a week or two ago about doing just this. 3" seems way too much to level.